Some aspects concerning the choice of rough vacuum pumps are presented. The comparison between three types of oil-free rough vacuum pumps and oil-sealed vacuum pumps was carried out according to their specific characteristics. It is shown that the cost of oil-free vacuum is 3-10 times higher than the cost of vacuum created by oil-sealed vacuum pumps but the specific power and delivery rate of pumps of both types are at grade.
вакуумный насос, безмасляный вакуум, удельные характеристики, средний вакуум, vacuum pump, oil-free vacuum, the specific characteristics of the average vacuum
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